Folding square.



1. w. PEARL.

FOLDING SQUARE.

APPLICATION FILED AUG3. |914. 1,161,961. Patented Nov. 30, 1915.

coLrMIHA vLANnmzAml co..\vAsmNG'roN. n. c.

JOSEPH Vw. BEARI., 0E. PORTLAND; onEGoN.

Vromaine sen-AEE."

Specification of Lettersllatent.

'Patented Nov. 30,1915.

i Application filed August 13, 1914. Serial No. 856,632.

To all whom t may concern: Y

Be it known that I, JOSEPH W. PEARL, a citizen 0f the United States,residing at Portland, in the county of Multnomah and State of Oregon,have invented certain new and useful Improvements inFolding Squares, ofwhich the following is a specification.

This invention relates to improvements in squares such as are used bycarpenters, millwrights and the like and has for its object to provide asquare adapted to be folded so that the two members of the square, whichwhen in use extend at right angles to each other,` when folded will bedisposed adjacent to and parallel with each other.

another object is to provide locking` means in a folding square of thischaracter adapted to effectually lock themembers in extended orfoldedposition without presenting any objectionable projection upon eitherside of the square. f

It is also one of the obj ects of this invention to provide meansthereon `for reading any angle at which the members may be disposed. j

I attain these and other objects, as will hereinafter appear, by meansof the improvements illustrated in the accompanying drawings in which,

Figure 1 is a front elevation of the square extended ready for use andalso shows in.

broken lines an adjustment to an angle other than 90 degrees. Fig.Q'shows a front elevation ofthe square folded. Fig. 3 is a detail frontelevation of the head of the long member shown in the other views. Fig.4 is a detail front elevation of the head of the short member of thesquare. Fig. 5 is an enlarged detail top kplan view of the subjectmatter shown in Fig. 4. Fig. 6 is a detail top plan view of the subjectmatter shownk in Fig. 3. Fig. 7 is a sectional top plan View through thecenterV of the lock slot and thumb recess, taken on 'the line Referringto the drawings, 1 designates the main or long member of the square andoomprehends a fiat rectangular blade having a semicircular dove-tailedrecess at 2 and a projection at 3 so disposed that its l edge which isbeveled as at 4 completes another quarter circle coaxial with andcontiguous to the outer edge of the recess 2.

.L The projection 3 and the recessed portion kare made one half as thickas the remainder of the blade. n

, The short, folding member of the square is designated as 5 and has asemicircular head or projection 6 with a beveled edge as Vat 7 adaptedto lit within the recess 2 in blade 1. rlhe head 6 of the blade isthinned to one half the thickness of the blade and dove-tail-recessed asat 8 to receive the edge 4 of theV projection 3 of blade l. The blade 5is provided with a shoulder at 9 adapted to engage the edge of blade 1at 10. f

The two members land 5 of the square are pivotally attached to eachotheras by a headed pin at 11 which passes through an orifice 12 provided inblade 1 and an orifice 13 provided in blade 5.

To lock the blades either in extended or folded position a spring lockbar 14 is mounted in a recess 15 provided in the head 6 wherein it isattached as by a rivet 18 as shown and the blade 1 is notched as at 16and 17 to receive the end yof the lock bar which extends slightly beyondthe edge of the head 6. A thumb recess 17a is provided adjacent notch 17so that the lock bar 14 may. be releasedl therefrom more easily.

If desired the lock-bar 14 may be provided with an index mark as at 19adapted to register with graduations which are provided upon blade 1 at2O so as to provide means for ascertaining the angle of the blades toone another when used as a bevel square. Y

It is obvious that a folding square of this charactermay be graduatedthe same as any non-folding square of similar proportions.

What is claimed is t-- Y 1.,.A folding square comprising a blade havinga dove-tailed circular recess in one end, another blade having acircular head with beveled edge adapted to fit within said recess andpivotally mounted therein, one of the blades being provided with notchesadjacent its circular edge and a spring lock bar mounted in theotherblade-so as to engage any one of the notches for the purpose 'of lockingthe blades in the desired positions.

2. A folding square comprising a blade having a circular recess in oneend,` another blade having a circular head adapted-to fit within saidrecess and pivotally mounted therein, one of said blades being providedwith notches adjacent its circular edge, a

vthe blades -in the desired position, one/of Yand said lock bar beingprovided With Aan spring lock bar mounted in` the other bladelgraduation marks for ascertaining the anso as yto engage any one of thenotches in gle ofthe blades toward one another.

the other blade for the purposeof locking ln testimony whereof I affixmy signature in the presence of two Witnesses.

f JOSEPH W. PEARL. Witnesses:

F. H. BRAKE, ALBERT J. MATTER.

said blades being provided with graduation marks adjacent the'circularedge thereof,

indicating mark to coperate with said ve cents each, by addressing theCommissioner of Patents.-

Copies of this patent may he kobtained for Washington, D. C.

